US 11,109,791 B2 · Diagnosis and monitoring of cardio-respiratory disorders

Abstract

Methods and systems estimate cardio-respiratory parameter(s), such as from in-phase and quadrature channels. The channels may represent patient chest movement and may be generated with a sensor, such as a contactless sensor that may sense movement with radio-frequency signals. In the methods/systems, the in-phase and quadrature channels may be processed, such as in a processor(s), using relative demodulation to generate cardio-respiratory parameter estimate(s). Optionally, the processing produces a jerk signal that may be filtered for producing a heart rate estimate, such as from zero-crossings of the filtered signal. Optionally, the processing produces a chest velocity signal that may be filtered for producing a respiratory rate estimate, such as from zero-crossings of the filtered signal. Optionally, a respiratory volume, such as tidal volume, may be estimated from an intrapulmonary pressure signal generated by applying a function to a chest displacement signal where the function relates intrapulmonary pressure and chest displacement.

Claims43

Dependent claims

A method of estimating a heart rate of a patient from an in-phase channel and a quadrature channel, each channel representing chest movement of the patient, the method comprising:

in one or more processors,
processing the in-phase channel and the quadrature channel by relative demodulation to generate a jerk signal, wherein the relative demodulation comprises numerically differentiating the in-phase channel and the quadrature channel to produce a numeric derivative of the in-phase channel and a numeric derivative of the quadrature channel, and generating a chest velocity signal from the numeric derivative of the in-phase channel and the numeric derivative of the quadrature channel;
filtering the jerk signal with a cardiac band-pass filter to produce a cardiac jerk signal;
and
generating a heart rate estimate from zero-crossings of the cardiac jerk signal.

2 more elements

Dependencies are inferred from the claim text.

Diagnosis and monitoring of cardio-respiratory disorders

Life of this patent

Diagnosis and monitoring of cardio-respiratory disorders

Life of this patent

Abstract

Claims43